R&S EU4200C
Audio via VoIP (Optional)
6174.8456.02-01
3.100
3.14
Audio via VoIP (Optional)
VoIP Mode\VoIP Mode " Radio". doc
This chapter
This chapter provides information about the VoIP mode. The R&S S4200
radio offers the possibility of digital audio transmission via voice over
internet protocol (VoIP). VoIP is a protocol driven communication standard.
VoIP is implemented according to EUROCAE ED-137B. The following VoIP
options are supported by the S4200 radio.
Option Key "VoIP"
This option key provides the mandatory features of ED137B Volume 1
"Radio", i.e. transmission of audio data between a VCS and the radio via
the VoIP protocol. It includes sophisticated extensions such as linked
sessions or dynamic delay compensation (relative and absolute delaying of
packets in Climax scenarios).
Option Key "7 VoIP
Sessions"
With a valid option key installed, the radio will accept up to 7 simultaneous
SIP sessions.
Option Key "Voice
Recorder"
This option key activates support for digital voice recording according to
"ED137B - Volume 4 Recorder". Up to two independent recorders can be
served simultaneously if the radio is in the VoIP mode. The radio controls
the recorder via the real-time streaming protocol (RTSP). Recording
payload is sent via the "RTP over independent TCP" approach, see
ED137B-4. The status of recording can be controlled (remotely) via the
command "Recording Active" or via the event list. The codec to be used for
voice recording can be configured to either A- or u-law via the parameter
"Recording Codec" irrespective of the codec used in the VoIP sessions.
3.14.1
Introduction/Overview
Introduction
This chapter explains basic mechanisms of VoIP communication. VoIP for
Air Traffic Management (ATM) represents an IP communication standard
which is adapted for ATM requirements.
Note:
VoIP is used for communication between a voice communication
system (VCS) or the R&S GB4000V over an IP network.
VoIP for ATM
VoIP standard uses the following protocols:
SIP (Session Initiation Protocol)
Application layer protocol for establishing, modifying and terminating
multimedia sessions based on RFC 3261.
SDP (Session Description Protocol)
Application layer protocol used for defining and negotiation of session
parameters which are used for a two-way RTP communication based on
RFC 4566.
RTP (Real-Time Transport Protocol)
Application layer protocol used for transporting audio data via network
based on RFC 3550.
R2S Protocol (R2 Signaling Protocol)
Protocol which offers a mechanism for “Keep Alive” signalling to control the
connection between the VCS or the R&S GB4000V and the radio.
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